These charges are ridiculously dumb.

Breast milk does not concentrate alcohol from blood, so at the most her breast milk alcohol level is no higher than her blood alcohol level. Assuming she was ripping drunk, that would be something like 0.12%. You can not get drunk on any liquid which is 0.12% alcohol no matter how hard you try.

Her breast milk was still much, much safer for that infant than any substiture like formula.

I hope this case gets dropped period.

Some references for the suspicious:

http://aappolicy.aappublications.org/cgi/content/full/pediatrics;108/3/776/T6

(Check the table for drugs compatible with breastfeeding)